public async Task <RecommendationsResponseDTO> GetRecommendations(string artistsIDs, string genresIDs)
{
RecommendationsResponseDTO recommendations = null;
// double work here wanted a list of strings but got a string of comma separated items
// so first to an array the passed as List
// TODO: see if possible to receive a list of strings from js
List <string> artists = artistsIDs != null?artistsIDs.Split(',').ToList() : null;
List <string> genres = genresIDs != null?genresIDs.Split(',').ToList() : null;
recommendations = await rest.GetRecommendationsAsync(await RetrieveToken(), artists, genres);
return(recommendations);
}
// Fetch recommendations based on given artists and/or genres
public async Task <RecommendationsResponseDTO> GetRecommendationsAsync(string token, List <string> artistsIDs, List <string> genreIDs)
{
RecommendationsResponseDTO recommendations = null;
int maxRecommendations = 10;
int minPopularity = 50;
string Endpoint = "https://api.spotify.com/v1/recommendations?";
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
string value = "Bearer " + token;
client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", value);
HttpResponseMessage response = new HttpResponseMessage();
string requestParameters = string.Format("limit={0}&min_popularity={1}", maxRecommendations, minPopularity);
//according to the Spotify api only a max of 5 seed strings can be sent to retrieve recommendations
//we give priority to artists over genre if received more than 5 from the user
int maxSeeds = 5;
//build artist IDs seed
if (artistsIDs != null && artistsIDs.Count() > 0)
{
string seedArtists = "";
foreach (string artistID in artistsIDs)
{
if (seedArtists != "")
{
seedArtists += ",";
}
seedArtists += artistID;
if (--maxSeeds == 0)
{
break;
}
}
requestParameters += "&seed_artists=" + seedArtists;
}
//build artist IDs seed
if (genreIDs != null && genreIDs.Count() > 0 && maxSeeds > 0)
{
string seedGenres = "";
foreach (string genreID in genreIDs)
{
if (seedGenres != "")
{
seedGenres += ",";
}
seedGenres += genreID;
if (--maxSeeds == 0)
{
break;
}
}
requestParameters += "&seed_genres=" + seedGenres;
}
string uri = string.Format(Endpoint + requestParameters);
response = await client.GetAsync(uri);
if (response.IsSuccessStatusCode)
{
var httpContent = response.Content;
StreamReader reader = new StreamReader(await httpContent.ReadAsStreamAsync(), Encoding.UTF8);
recommendations = (RecommendationsResponseDTO)JsonConvert.DeserializeObject(reader.ReadToEnd(), typeof(RecommendationsResponseDTO));
}
return(recommendations);
}
